Office (OLE) malware analysis — malicious · 3dce2d400ff0eb6d

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:37:49 Authoring application: Microsoft Excel

MD5: 249103f9e9bb22ffa6bf6d8c93ace6f9 SHA-1: 850300209bae9e6a4759cab809aba80fa0d58d94 SHA-256: 3dce2d400ff0eb6d4acff1f673ae29481b8a493b89f20977e91d059bceced4c2

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

Static analysis revealed the presence of Excel 4.0 macros, specifically an Auto_Open defined name, which is a known technique for executing arbitrary code. The critical heuristic firings indicate the use of dangerous formula APIs within the Auto_Open macro, suggesting an attempt to run malicious commands or exploit vulnerabilities. The document body contains a large amount of seemingly random characters, which could be obfuscation or part of a payload.

Heuristics 3

Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME

oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN

Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN

Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `d627af09fb1785314f043846d58191bf24d8ced93e11e94938ab59409ecdcd78`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6767 bytes

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